/* -------------------------------------------------------------------------------

Copyright (C) 1999-2007 id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

GtkRadiant is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

----------------------------------------------------------------------------------

This code has been altered significantly from its original form, to support
several games based on the Quake III Arena engine, in the form of "Q3Map2."

------------------------------------------------------------------------------- */



/* marker */
#define WRITEBSP_C



/* dependencies */
#include "q3map2.h"



/*
EmitShader()
emits a bsp shader entry
*/

int	EmitShader( const char *shader, int *contentFlags, int *surfaceFlags )
{
	int				i;
	shaderInfo_t	*si;
	
	
	/* handle special cases */
	if( shader == NULL )
		shader = "noshader";
	
	/* try to find an existing shader */
	for( i = 0; i < numBSPShaders; i++ )
	{
		/* ydnar: handle custom surface/content flags */
		if( surfaceFlags != NULL && bspShaders[ i ].surfaceFlags != *surfaceFlags )
			continue;
		if( contentFlags != NULL && bspShaders[ i ].contentFlags != *contentFlags )
			continue;
		
		/* compare name */
		if( !Q_stricmp( shader, bspShaders[ i ].shader ) )
			return i;
	}

	// i == numBSPShaders
	
	/* get shaderinfo */
	si = ShaderInfoForShader( shader );
	
	/* emit a new shader */
	AUTOEXPAND_BY_REALLOC_BSP(Shaders, 1024);

	numBSPShaders++;
	strcpy( bspShaders[ i ].shader, shader );
	bspShaders[ i ].surfaceFlags = si->surfaceFlags;
	bspShaders[ i ].contentFlags = si->contentFlags;
	
	/* handle custom content/surface flags */
	if( surfaceFlags != NULL )
		bspShaders[ i ].surfaceFlags = *surfaceFlags;
	if( contentFlags != NULL )
		bspShaders[ i ].contentFlags = *contentFlags;
	
	/* recursively emit any damage shaders */
	if( si->damageShader != NULL && si->damageShader[ 0 ] != '\0' )
	{
		Sys_FPrintf( SYS_VRB, "Shader %s has damage shader %s\n", si->shader, si->damageShader );
		EmitShader( si->damageShader, NULL, NULL );
	}
	
	/* return it */
	return i;
}



/*
EmitPlanes()
there is no oportunity to discard planes, because all of the original
brushes will be saved in the map
*/

void EmitPlanes( void )
{
	int			i;
	bspPlane_t	*bp;
	plane_t		*mp;
	
	
	/* walk plane list */
	mp = mapplanes;
	for( i = 0; i < nummapplanes; i++, mp++ )
	{
		AUTOEXPAND_BY_REALLOC_BSP(Planes, 1024);
		bp = &bspPlanes[ numBSPPlanes ];
		VectorCopy( mp->normal, bp->normal );
		bp->dist = mp->dist;
		numBSPPlanes++;
	}
	
	/* emit some statistics */
	Sys_FPrintf( SYS_VRB, "%9d BSP planes\n", numBSPPlanes );
}



/*
EmitLeaf()
emits a leafnode to the bsp file
*/

void EmitLeaf( node_t *node )
{
	bspLeaf_t		*leaf_p;
	brush_t			*b;
	drawSurfRef_t	*dsr;

	
	/* check limits */
	if( numBSPLeafs >= MAX_MAP_LEAFS )
		Error( "MAX_MAP_LEAFS" );

	leaf_p = &bspLeafs[numBSPLeafs];
	numBSPLeafs++;

	leaf_p->cluster = node->cluster;
	leaf_p->area = node->area;

	/* emit bounding box */
	VectorCopy( node->mins, leaf_p->mins );
	VectorCopy( node->maxs, leaf_p->maxs );
	
	/* emit leaf brushes */
	leaf_p->firstBSPLeafBrush = numBSPLeafBrushes;
	for( b = node->brushlist; b; b = b->next )
	{
		/* something is corrupting brushes */
		if( (size_t) b < 256 )
		{
			Sys_Printf( "WARNING: Node brush list corrupted (0x%08X)\n", b );
			break;
		}
		//%	if( b->guard != 0xDEADBEEF )
		//%		Sys_Printf( "Brush %6d: 0x%08X Guard: 0x%08X Next: 0x%08X Original: 0x%08X Sides: %d\n", b->brushNum, b, b, b->next, b->original, b->numsides );
		
		AUTOEXPAND_BY_REALLOC_BSP(LeafBrushes, 1024);
		bspLeafBrushes[ numBSPLeafBrushes ] = b->original->outputNum;
		numBSPLeafBrushes++;
	}
	
	leaf_p->numBSPLeafBrushes = numBSPLeafBrushes - leaf_p->firstBSPLeafBrush;
	
	/* emit leaf surfaces */
	if( node->opaque )
		return;
	
	/* add the drawSurfRef_t drawsurfs */
	leaf_p->firstBSPLeafSurface = numBSPLeafSurfaces;
	for ( dsr = node->drawSurfReferences; dsr; dsr = dsr->nextRef )
	{
		AUTOEXPAND_BY_REALLOC_BSP(LeafSurfaces, 1024);
		bspLeafSurfaces[ numBSPLeafSurfaces ] = dsr->outputNum;
		numBSPLeafSurfaces++;			
	}
	
	leaf_p->numBSPLeafSurfaces = numBSPLeafSurfaces - leaf_p->firstBSPLeafSurface;
}


/*
EmitDrawNode_r()
recursively emit the bsp nodes
*/

int EmitDrawNode_r( node_t *node )
{
	bspNode_t	*n;
	int			i, n0;
	
	
	/* check for leafnode */
	if( node->planenum == PLANENUM_LEAF )
	{
		EmitLeaf( node );
		return -numBSPLeafs;
	}
	
	/* emit a node */
	AUTOEXPAND_BY_REALLOC_BSP(Nodes, 1024);
	n0 = numBSPNodes;
	n = &bspNodes[ n0 ];
	numBSPNodes++;
	
	VectorCopy (node->mins, n->mins);
	VectorCopy (node->maxs, n->maxs);

	if (node->planenum & 1)
		Error ("WriteDrawNodes_r: odd planenum");
	n->planeNum = node->planenum;

	//
	// recursively output the other nodes
	//	
	for (i=0 ; i<2 ; i++)
	{
		if (node->children[i]->planenum == PLANENUM_LEAF)
		{
			n->children[i] = -(numBSPLeafs + 1);
			EmitLeaf (node->children[i]);
		}
		else
		{
			n->children[i] = numBSPNodes;	
			EmitDrawNode_r (node->children[i]);
			// n may have become invalid here, so...
			n = &bspNodes[ n0 ];
		}
	}

	return n - bspNodes;
}



/*
============
SetModelNumbers
============
*/
void SetModelNumbers (void)
{
	int		i;
	int		models;
	char	value[10];

	models = 1;
	for ( i=1 ; i<numEntities ; i++ ) {
		if ( entities[i].brushes || entities[i].patches ) {
			sprintf ( value, "*%i", models );
			models++;
			SetKeyValue (&entities[i], "model", value);
		}
	}

}




/*
SetLightStyles()
sets style keys for entity lights
*/

void SetLightStyles( void )
{
	int			i, j, style, numStyles;
	const char	*t;
	entity_t	*e;
	epair_t		*ep, *next;
	char		value[ 10 ];
	char		lightTargets[ MAX_SWITCHED_LIGHTS ][ 64 ];
	int			lightStyles[ MAX_SWITCHED_LIGHTS ];

	/* ydnar: determine if we keep lights in the bsp */
	if (KeyExists(&entities[ 0 ], "_keepLights") == qtrue)
	{
		t = ValueForKey( &entities[ 0 ], "_keepLights" );
		keepLights = (t[ 0 ] == '1') ? qtrue : qfalse;
	}
	
	/* any light that is controlled (has a targetname) must have a unique style number generated for it */
	numStyles = 0;
	for( i = 1; i < numEntities; i++ )
	{
		e = &entities[ i ];

		t = ValueForKey( e, "classname" );
		if( Q_strncasecmp( t, "light", 5 ) )
			continue;
		t = ValueForKey( e, "targetname" );
		if( t[ 0 ] == '\0' )
		{
			/* ydnar: strip the light from the BSP file */
			if( keepLights == qfalse )
			{
				ep = e->epairs;
				while( ep != NULL )
				{
					next = ep->next;
					free( ep->key );
					free( ep->value );
					free( ep );
					ep = next;
				}
				e->epairs = NULL;
				numStrippedLights++;
			}
			
			/* next light */
			continue;
		}
		
		/* get existing style */
		style = IntForKey( e, "style" );
		if( style < LS_NORMAL || style > LS_NONE )
			Error( "Invalid lightstyle (%d) on entity %d", style, i );
		
		/* find this targetname */
		for( j = 0; j < numStyles; j++ )
			if( lightStyles[ j ] == style && !strcmp( lightTargets[ j ], t ) )
				break;
		
		/* add a new style */
		if( j >= numStyles )
		{
			if( numStyles == MAX_SWITCHED_LIGHTS )
				Error( "MAX_SWITCHED_LIGHTS (%d) exceeded, reduce the number of lights with targetnames", MAX_SWITCHED_LIGHTS );
			strcpy( lightTargets[ j ], t );
			lightStyles[ j ] = style;
			numStyles++;
		}
		
		/* set explicit style */
		sprintf( value, "%d", 32 + j );
		SetKeyValue( e, "style", value );
		
		/* set old style */
		if( style != LS_NORMAL )
		{
			sprintf( value, "%d", style );
			SetKeyValue( e, "switch_style", value );
		}
	}
	
	/* emit some statistics */
	Sys_FPrintf( SYS_VRB, "%9d light entities stripped\n", numStrippedLights );
}



/*
BeginBSPFile()
starts a new bsp file
*/

void BeginBSPFile( void )
{
	/* these values may actually be initialized if the file existed when loaded, so clear them explicitly */
	numBSPModels = 0;
	numBSPNodes = 0;
	numBSPBrushSides = 0;
	numBSPLeafSurfaces = 0;
	numBSPLeafBrushes = 0;
	
	/* leave leaf 0 as an error, because leafs are referenced as negative number nodes */
	numBSPLeafs = 1;
	
	
	/* ydnar: gs mods: set the first 6 drawindexes to 0 1 2 2 1 3 for triangles and quads */
	numBSPDrawIndexes = 6;
	bspDrawIndexes[ 0 ] = 0;
	bspDrawIndexes[ 1 ] = 1;
	bspDrawIndexes[ 2 ] = 2;
	bspDrawIndexes[ 3 ] = 0;
	bspDrawIndexes[ 4 ] = 2;
	bspDrawIndexes[ 5 ] = 3;
}



/*
EndBSPFile()
finishes a new bsp and writes to disk
*/

void EndBSPFile( void )
{
	char	path[ 1024 ];
	

	Sys_FPrintf( SYS_VRB, "--- EndBSPFile ---\n" );

	EmitPlanes();
	
	numBSPEntities = numEntities;
	UnparseEntities();
	
	/* write the surface extra file */
	WriteSurfaceExtraFile( source );
	
	/* write the bsp */
	sprintf( path, "%s.bsp", source );
	Sys_Printf( "Writing %s\n", path );
	WriteBSPFile( path );
}



/*
EmitBrushes()
writes the brush list to the bsp
*/

void EmitBrushes( brush_t *brushes, int *firstBrush, int *numBrushes )
{
	int				j;
	brush_t			*b;
	bspBrush_t		*db;
	bspBrushSide_t	*cp;
	
	
	/* set initial brush */
	if( firstBrush != NULL )
		*firstBrush = numBSPBrushes;
	if( numBrushes != NULL )
		*numBrushes = 0;
	
	/* walk list of brushes */
	for( b = brushes; b != NULL; b = b->next )
	{
		/* check limits */
		AUTOEXPAND_BY_REALLOC_BSP(Brushes, 1024);
		
		/* get bsp brush */
		b->outputNum = numBSPBrushes;
		db = &bspBrushes[ numBSPBrushes ];
		numBSPBrushes++;
		if( numBrushes != NULL )
			(*numBrushes)++;
		
		db->shaderNum = EmitShader( b->contentShader->shader, &b->contentShader->contentFlags, &b->contentShader->surfaceFlags );
		db->firstSide = numBSPBrushSides;
		
		/* walk sides */
		db->numSides = 0;
		for( j = 0; j < b->numsides; j++ )
		{
			/* set output number to bogus initially */
			b->sides[ j ].outputNum = -1;
			
			/* check count */
			AUTOEXPAND_BY_REALLOC_BSP(BrushSides, 1024);
			
			/* emit side */
			b->sides[ j ].outputNum = numBSPBrushSides;
			cp = &bspBrushSides[ numBSPBrushSides ];
			db->numSides++;
			numBSPBrushSides++;
			cp->planeNum = b->sides[ j ].planenum;
			
			/* emit shader */
			if( b->sides[ j ].shaderInfo )
				cp->shaderNum = EmitShader( b->sides[ j ].shaderInfo->shader, &b->sides[ j ].shaderInfo->contentFlags, &b->sides[ j ].shaderInfo->surfaceFlags );
			else
				cp->shaderNum = EmitShader( NULL, NULL, NULL );
		}
	}
}



/*
EmitFogs() - ydnar
turns map fogs into bsp fogs
*/

void EmitFogs( void )
{
	int			i, j;
	
	
	/* setup */
	numBSPFogs = numMapFogs;
	
	/* walk list */
	for( i = 0; i < numMapFogs; i++ )
	{
		/* set shader */
		strcpy( bspFogs[ i ].shader, mapFogs[ i ].si->shader );
		
		/* global fog doesn't have an associated brush */
		if( mapFogs[ i ].brush == NULL )
		{
			bspFogs[ i ].brushNum = -1;
			bspFogs[ i ].visibleSide = -1;
		}
		else
		{
			/* set brush */
			bspFogs[ i ].brushNum = mapFogs[ i ].brush->outputNum;
			
			/* try to use forced visible side */
			if( mapFogs[ i ].visibleSide >= 0 )
			{
				bspFogs[ i ].visibleSide = mapFogs[ i ].visibleSide;
				continue;
			}
			
			/* find visible side */
			for( j = 0; j < 6; j++ )
			{
				if( mapFogs[ i ].brush->sides[ j ].visibleHull != NULL )
				{
					Sys_Printf( "Fog %d has visible side %d\n", i, j );
					bspFogs[ i ].visibleSide = j;
					break;
				}
			}
		}
	}
}



/*
BeginModel()
sets up a new brush model
*/

void BeginModel( void )
{
	bspModel_t	*mod;
	brush_t		*b;
	entity_t	*e;
	vec3_t		mins, maxs;
	vec3_t		lgMins, lgMaxs;		/* ydnar: lightgrid mins/maxs */
	parseMesh_t	*p;
	int			i;
	
	
	/* test limits */
	AUTOEXPAND_BY_REALLOC_BSP(Models, 256);
	
	/* get model and entity */
	mod = &bspModels[ numBSPModels ];
	e = &entities[ mapEntityNum ];
	
	/* ydnar: lightgrid mins/maxs */
	ClearBounds( lgMins, lgMaxs );
	
	/* bound the brushes */
	ClearBounds( mins, maxs );
	for ( b = e->brushes; b; b = b->next )
	{
		/* ignore non-real brushes (origin, etc) */
		if( b->numsides == 0 )
			continue;
		AddPointToBounds( b->mins, mins, maxs );
		AddPointToBounds( b->maxs, mins, maxs );
		
		/* ydnar: lightgrid bounds */
		if( b->compileFlags & C_LIGHTGRID )
		{
			AddPointToBounds( b->mins, lgMins, lgMaxs );
			AddPointToBounds( b->maxs, lgMins, lgMaxs );
		}
	}
	
	/* bound patches */
	for( p = e->patches; p; p = p->next )
	{
		for( i = 0; i < (p->mesh.width * p->mesh.height); i++ )
			AddPointToBounds( p->mesh.verts[i].xyz, mins, maxs );
	}
	
	/* ydnar: lightgrid mins/maxs */
	if( lgMins[ 0 ] < 99999 )
	{
		/* use lightgrid bounds */
		VectorCopy( lgMins, mod->mins );
		VectorCopy( lgMaxs, mod->maxs );
	}
	else
	{
		/* use brush/patch bounds */
		VectorCopy( mins, mod->mins );
		VectorCopy( maxs, mod->maxs );
	}
	
	/* note size */
	Sys_FPrintf( SYS_VRB, "BSP bounds: { %f %f %f } { %f %f %f }\n", mins[ 0 ], mins[ 1 ], mins[ 2 ], maxs[ 0 ], maxs[ 1 ], maxs[ 2 ] );
	Sys_FPrintf( SYS_VRB, "Lightgrid bounds: { %f %f %f } { %f %f %f }\n", lgMins[ 0 ], lgMins[ 1 ], lgMins[ 2 ], lgMaxs[ 0 ], lgMaxs[ 1 ], lgMaxs[ 2 ] );
	
	/* set firsts */
	mod->firstBSPSurface = numBSPDrawSurfaces;
	mod->firstBSPBrush = numBSPBrushes;
}




/*
EndModel()
finish a model's processing
*/

void EndModel( entity_t *e, node_t *headnode )
{
	bspModel_t	*mod;
	
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- EndModel ---\n" );
	
	/* emit the bsp */
	mod = &bspModels[ numBSPModels ];
	EmitDrawNode_r( headnode );
	
	/* set surfaces and brushes */
	mod->numBSPSurfaces = numBSPDrawSurfaces - mod->firstBSPSurface;
	mod->firstBSPBrush = e->firstBrush;
	mod->numBSPBrushes = e->numBrushes;
	
	/* increment model count */
	numBSPModels++;
}



